Mistral launches Medium 3.5, remote coding agents in Vibe, and Work mode in Le Chat

Mistral has launched Mistral Medium 3.5 in public preview and is using the model to power new remote coding agents in Mistral Vibe and a new Work mode in Le Chat.

Medium 3.5 is a 128B dense model with a 256k context window that combines instruction following, reasoning, coding, and vision in one model. Mistral is releasing the model as open weights under a modified MIT license and pricing API access at $1.5 per million input tokens and $7.5 per million output tokens.

Vibe remote agents can be started from the Vibe CLI or directly from Le Chat, run in cloud sandboxes, continue asynchronously, and return completed work as a branch or draft pull request. Existing local CLI sessions can be moved to the cloud while preserving session history and approvals.

The same announcement introduced Work mode in Le Chat as a preview feature for multi-step tasks across connected tools. The feature can read and write across tools, call multiple tools in parallel, and request approval before sensitive actions. Medium 3.5 is now the default model in Le Chat and replaces Devstral 2 in Vibe CLI.

Notes for review: Vendor announcement. Performance claims in the post are vendor-reported.